Insulator.



D. H. FRIEND.

INSULATOR.

APPLICATION FILED MAY 24, 1910.

Patented Max:1 1, 1911;

FM Dr! I y JYIF IE'RJ.

I atto'mwq DAVID H. FRIEND, or CANTON, 01110.

msumron.

Specification 61' Letters Patent.

Patented Mar. 14,1911.

Application filed May 24, 1910. Serial No. 563,112;

To all whom it may concern:

Be it known that I,'DAvn) H. F RIEND, a citizen of the United States of America, residing at Canton, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Insulators, of

which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to means for supporting electric wires and has especial reference to telegraph and telephone wires, and to means for securing said wires to posts or other supports.

The invention has for its object to provide meansfor securing said telegraph and telephone wires to posts or other supports known as insulators.

This invention further has for its object to provide an improved insulator by means of which the wire may be fastened thereto without any extra fastening means;

This invention further has for its object to provide an insulator by means of which the wire will be securely held from sa ging.

The invention further has for its ob ect to provide an insulator by means of which Wire can be readily and quickly secured in place and detached from the insulator.

Referring to the accompanying drawings,Figure 1 is a view in perspective of an insulator constructed in accordance with this invention. Fig. 2 is a side view on a similar scale of the insulator with a portion of the base portion broken away, and in vertical section. Fig. 3 is a plan view on the line ww, of Fig. 2, in horizontal section. Fig. 4 is a side view of the insulator looking from theright in Fig. 2. Fig. 5 is an enlargedview inperspectiveof the insulator with a portion thereof broken away to show the internal construction of the,

upper portion thereof.

In carrying out the invention, I provide an insulator made of glass, porcelain or other suitable insulating material, and formed with a cylindrical base portion 1 having a central threaded socket 2 projecting up through the base from its bottom. The insulator is provided upon its under surface with an annular groove 3, for increasing the path over which the current must pass on the insulators surface in case the same should become covered with a thin sheet of moisture as very often happens. The insulator is formed also with the usual annular groove; 4 located at the top of the ass portion 1 above which extends the conical upper part 5 of the insulator; In order to secure a wire to the insulator, it is formed with a transverse slot 6 open at the top of the conical portion 5 and extending from side to side thereof and down to a point just above the base portion 1. the bottom of the transverse slot 6 on one side thereof is acurved groove 7 having its open ends in the sides of the conical top portion 5 and forming an overlapping shoul der 8 at each end of the groove. One face of the transverse slot 6 on the side in which the curved groove 7 is located is preferably Adj acent "toformed with aconcaved face 9 terminating at its lower end at the groove 7, and the op-' posite face of the transverse slot 6 is formed with'an inclined face 10 which is convex in cross section and terminates at its lower end opposite to the side of the groove 7. It will be seen that by means of this construction a wire 11 being passed downthrougli the slot 6 will be bent by the convex and concave surfaces of the sides of the slot 6 and when it has reached the bottom of the slot 6 when moved laterally will fit into the curved groove 7 and held therein. against vertical movement by means of the shouldered ends 8 of the groove and also will be tightly held therein by the convex surface 10 of one side of the groove 6. The wire so bent and wedged into the curved groove will be held against transverse strain and prevent it from moving lengthwise. By this means, the wires so fastened to posts or other supports at intervals will be prevented from sagging between said posts. It will be seen further that by means of this invention all extra fasteners are dispensed with and that it will not be necessary to use extra means for securing and detaching the wire from connection with the insulator and'that it may be readily placed into and pulled out of said insulator.

What I claim as my invention is An insulator comprising a base portion with a central threaded socket therein, and

provided with an annular groove on its un-- der surface, said basehaving on its upper portion a cone-shaped head which is divided 3 I In testirnonywhereof I hereunto afiix my by a transverse slot extending down into signature in presence'of 'two witnesses.

the same and terminating in a'right angular T groove which extends into one portion of DAVID FRIEB the cone, said groove being curved continu- Witnesses:

ously and uninterrupted, and of the same RALPH W. FRIEND,

widththroughout its entire length. M. W. RICHARDS, Jr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

